Welding rod



Patented May 29, 1928. v

RUSSELL FRANK S, OF ELMH'URS'I, NEW YORK, ASSIGNOR T0 OXWELD ACETYLENE it COMPANY, A CORPORATION OF WEST VIRGINIA.

WELDING, BOD.

no Drawing. I

It is often desirable to provide a metal article with a point, edge surface or sheath of a. metal or alloy which isharder ormore re- 'sist-ant to wearthan the metal constituting the bulk of the article. .It has been proposed to use welding rods and electrodes of such compositions that hard wear-resisting metal can be deposited therefrom on any suitable base by fusing the rod or the like with the blow-pipe flame or the electric-arc and suit ably manipulating the fused metal. The present invention is a rod 'or" electrode of this class.

I11 application Ser. No. 77,575, filed by Bu'rnhamlfl. Field and the present applicant on December 24, 1925, there are described and claimed certain new alloys suitable as material for castin'g wear-resisting members. The object of the present invention is to modifythe compositions described in the application referred to so that the modified compositions can be made into rods or electrodes and metal deposited therefrom by fusion to give sound and homogeneous deposits of metal of goodwear-resisting properties.

The constituents of the alloy described in the joint application, and their preferred proportions, are as follows:

Per cent. Tungsten 1.0 to 12 Chromium 25 to 35 Carbon 1.0 to 3.5 Boron O.1 to 1.0

with the remainder principally iron. I have found that good welding alloys can'be made by varying the tungsten, chromium, carbon and boron through the ranges given above, it being of course understood that each of these elements tends to produce brittleness if increased to the upper limit ofv its ran'ge, so that maximum proportionsv of all the elements should not be used in a single alloy. I have found, however, that, in preparing alloys of the above composition for welding or other like depositing operations, it is. necessary to have a regulated silicon content in the alloy, whereas silicon is not an Application filed January 21, 1926. Serial No. 82,859.

essential constituent if the alloy is intended for casting. With a suitably adjusted silicon content the fluidity of the molten alloy is increased and the deposited metal is homogeneous and almost completely free from the blow-holes which usually occur otherwise. 5

The silicon content should have a value within the range 0.50% to 3.0%, and the best results have been obtained with silicon between 1.0% and 1.5%.

I have also found that the content of w manganese in the alloy and especially its proportion to the silicon are important when the alloy is to be deposited from a rod or electrode. Manganese is advantageously added to ing it from the original melt as it deoxidizes the metal and increases its fluidity," and I find that a small content of manganese in the alloy renders it better adapted forwelding and like depositin'g operations. A moderate excess of manganese over the amount required to deoxidize the metal is without important effect so long as the alloy is used only for casting, but when the alloy is used for welding and like depositing operations, increasing the manganese beyond certain limits has a detrimental effect. The percentage of manganese should not materially exceed that of silicon. My experi-' ments indicate that the ratio of silicon content to manganese content should be at least 0.9. The best results have been obtained with a silicon: mangnese ratio of 1.0 and upward, Usually the quantity of manganese required to insure satisfactory casting and to impart good weldingqualities will prevent he -ratio from exceeding 12. The introduction of a silicon content in accordance with the invention is readily accomplished,

the alloy just before casta a suitable commercial silicon alloy being added as in many other metallurgical operations. The finished alloy is cast into rods or electrodes of any suitable form for use in welding.

I claim:

1.- A welding rod composed of alloy cont tity to deoxidize the alloy, the ratio of jsilimanganese being at least 0.9.

taining tungsten 1% to 12%, chromium to 35%, boron'0.10% to'1.0%, carbon 1.0% to 25% to 35%, boron 0.10% to 1.0%, carbon 3.5%, silicon .at least 1.0% and not over 1.0% to 3.5%,si1icon at least 0.50% and not 1.5%", and manganese in suflicient quantity over 3.0%, and manganese in suflicient quan-, to deoxidize the alloy, the ratio of silicon to I con to manganese being at least 0.9. r In testimony whereof, I aflixmy signature.

2. A Welding rod "composed of alloy conta-ining tungsten 1% to 12%, chromium 25% V RUSSELL FRANKS. 

